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Test method and metrics to evaluate quality of road feedback to driver in a steer-by-wire system

Inactive Publication Date: 2020-01-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for evaluating the quality of road feedback in a steer-by-wire system. The method involves preparing a test bench, preloading the steering system with data, and applying tie rod load signals to the system. The recorded signals are then analyzed using a fast Fourier transform algorithm to calculate various metrics such as the gain response, phase response, and coherence response. These metrics are then saved as tactile feedback for the driver. The technical effect of this method is to provide a more accurate and reliable measure of the quality of road feedback in a steer-by-wire system.

Problems solved by technology

This is a difficult task especially for hi-frequency “dynamic” feedback loads.

Method used

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  • Test method and metrics to evaluate quality of road feedback to driver in a steer-by-wire system
  • Test method and metrics to evaluate quality of road feedback to driver in a steer-by-wire system
  • Test method and metrics to evaluate quality of road feedback to driver in a steer-by-wire system

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Embodiment Construction

[0036]The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

[0037]Referring to FIG. 1, a steer-by-wire feedback system 10 includes a steering wheel 12 which when rotated by a vehicle driver, shown in reference to FIG. 6, actuates a sensor inside an electric motor defining a torque feedback actuator 14 which generates electrical signals representing steering wheel angular rotation to a vehicle steering system or steering rack 16. The steering rack 16 is connected using at least one tie rod 18 to at least one steerable wheel 20 which directly contacts a road surface 22. In the steer-by-wire feedback system 10 there is no mechanical connection between the steering wheel 12 and the steering rack 16. There is therefore no direct mechanical connection to the steering wheel 12 of a steering wheel torque 24 that is generated by an input road load 26 from the wheel 20 which is defined as a combination of a vertical f...

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Abstract

A method to evaluate a quality of road feedback to a driver in a steer-by-wire system includes setting a test bench by grounding a steering system steering wheel using a physical 6th order impedance constraint; preloading the steering system with data defining a steering wheel angle and a vehicle speed; applying tie rod load signals to the steering system and recording signals representing each of a tie rod load, a steering wheel torque and a steering wheel acceleration. In parallel: applying first a fast Fourier transform algorithm to the recorded signals to calculate each of a gain, a phase and a coherence response from the tie rod load to the steering wheel torque; applying second a fast Fourier transform algorithm to the recorded signals to calculate a power spectral density of the steering wheel torque versus frequency; and applying frequency weighting functions to the gain and power spectral density functions.

Description

INTRODUCTION[0001]The present disclosure relates to automobile vehicle steer-by-wire systems including providing torque feedback to the driver of a vehicle having a steer-by-wire system.[0002]Automobile vehicle drivers use high frequency torque vibrations received through a steering wheel of the vehicle to obtain information about the road surface. Automobile vehicle steer-by-wire systems have no mechanical connection between a steering wheel operated by the driver and the road surface. Any feedback from the road surface to the driver through the steering wheel must therefore be electronically synthesized and recreated using a steering wheel torque actuator. This is a difficult task especially for hi-frequency “dynamic” feedback loads.[0003]Thus, while current automobile vehicle steer-by-wire systems achieve their intended purpose, there is a need for new and improved test methods and metrics to objectively evaluate dynamic road feedback performance for automobile vehicle steer-by-w...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/00
CPCB62D5/006B62D6/008G01M17/06G05B23/02B62D5/0457G05B2219/23446
Inventor YU, BOBADIRU, IBRAHIM A.AIUTO, STEVENDE PAULA EDUARDO, GABRIEL
Owner GM GLOBAL TECH OPERATIONS LLC